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Risks and Financial Instruments - summary of foreign exchange hedging instruments designated as fair value hedge (Detail)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
USD ($)
Disclosure of detailed information about hedges [line items]        
Notional amount - R$ R$ 90.0      
Result of hedging instruments - gain/(loss) - R$ 0.6      
Fair value adjustment of debt - R$ (0.2)      
Financial expense in the statements of profit or loss - R$ R$ (0.4)      
Average effective cost - DI % 99.90% 99.90%    
Foreign exchange hedging instruments [member]        
Disclosure of detailed information about hedges [line items]        
Notional amount - R$ | $   $ 395.0   $ 395.0
Result of hedging instruments - gain/(loss) - R$ R$ 79.5   R$ 149.2  
Fair value adjustment of debt - R$ (36.8)   (28.5)  
Financial expense in the statements of profit or loss - R$ R$ (130.3)   R$ (215.9)  
Average effective cost - DI % 104.40% 104.40% 104.40% 104.40%
Interest rate hedging instruments [member]        
Disclosure of detailed information about hedges [line items]        
Notional amount - R$ R$ 806.1   R$ 806.1  
Result of hedging instruments - gain/(loss) - R$ 73.0   25.8  
Fair value adjustment of debt - R$ (77.0)   (13.3)  
Financial expense in the statements of profit or loss - R$ R$ (68.1)   R$ (50.2)  
Average effective cost - DI % 95.80% 95.80% 95.80% 95.80%